wp-includes/deprecated.php:2739Get site index relational link.
stringOne hook fires while get_index_rel_link() runs, in this order:
function get_index_rel_link() { _deprecated_function( __FUNCTION__, '3.3.0' ); $link = "<link rel='index' title='" . esc_attr( get_bloginfo( 'name', 'display' ) ) . "' href='" . esc_url( user_trailingslashit( get_bloginfo( 'url', 'display' ) ) ) . "' />\n"; return apply_filters( "index_rel_link", $link );}Introduced in 2.8.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/deprecated.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.